Support multiple lines of rustdoc as a type description.

async-graphql-derive/src/utils.rs

@@ -222,17 +222,25 @@ pub fn parse_guards(crate_name: &TokenStream, args: &MetaList) -> Result<Option<
 }
 
 pub fn get_rustdoc(attrs: &[Attribute]) -> Result<Option<String>> {
+    let mut full_docs = String::new();
     for attr in attrs {
         match attr.parse_meta()? {
             Meta::NameValue(nv) if nv.path.is_ident("doc") => {
                 if let Lit::Str(doc) = nv.lit {
                     let doc = doc.value();
                     let doc_str = doc.trim();
-                    return Ok(Some(doc_str.to_string()));
+                    if !full_docs.is_empty() {
+                        full_docs += "\n";
+                    }
+                    full_docs += doc_str;
                 }
             }
             _ => {}
         }
     }
-    Ok(None)
+    Ok(if full_docs.is_empty() {
+        None
+    } else {
+        Some(full_docs)
+    })
 }

tests/introspection.rs

@@ -144,6 +144,8 @@ struct Mutation;
 #[Object(desc = "Global mutation")]
 impl Mutation {
     /// simple_mutation description
+    /// line2
+    /// line3
     async fn simple_mutation(&self, _input: SimpleInput) -> SimpleObject {
         unimplemented!()
     }
@@ -919,7 +921,7 @@ pub async fn test_introspection_mutation() {
             "description": "Global mutation",
             "fields": [
               {
-                "description": "simple_mutation description",
+                "description": "simple_mutation description\nline2\nline3",
                 "name": "simpleMutation",
                 "type": {
                   "kind": "NON_NULL",